Valve seat iforming apparatus



April 1l, 1950 w. 1 NELSON vALvE SEAT FORMING APPARATUS Filed Feb. 1o, 1945 HTW..`

A Q@ Q Nv Arrow/fr Patented Apr. 11, 1950 UNITED STATES PATENT -OFFI C-E VALVE SEAT FORMING ,APPARATUS Wilbur L. Nelson, `Chicago, Ill., assigner vto West- VVern Electric Company, Incorporated, New York, N. Y., 'a corporation of 1N ew York Application February 1o, 1945, serial No. .57.11.321

4 Claims.

A'Ihs invention relates toa valve .seat forming apparatus and more particularly to an apparatus for 4forming cooperating surfaces of valves 'for crystal converters to Iproperly seat movable valve members against their valve seats.

vIt is an object of the present invention to .pro-1 vide a simple and automatic apparatus for effectively and expeditiously seating valves on their associated valve seats.

`In accordance with one embodiment ofthe invention as applied to an apparatus for forming cooperating vsurfaces of valves of the type disclosed in Patent No. 2,456,305, issued December 14, 1948, to W. L. Nelson, ontheir associated valve seats, an apparatus is yprovided for holding the crystal converter unit in a fixed position 'to have the valve reciprocated by a vrotatable and reciprocatable shaft having chuck thereon lfor holding the valve stem, .,Amo'tor, operable through a speed reducer to drive a sleeve, also drives a Wheel having cam surfaces thereon for closing a switch to energize a solenoid repeatedly intimed relation to the rotation of thesleeve. .'Ihe rotatable sleeve Vis recessed to receive an end of a shaft and has .a cam therein adapted to cooperate with ya :pin on the shaft *whereby rotation is imparted Yto the shaft and chuck carried thereby intermittently when the valve is out of engagement with its valve seat, thus to Vvrepeatedly `bump .the valve against opposing valve seats while the valve is not rotating and to rotate the valve during the reciprocating movement, but not during the vbumping por# tion of the zreciprocation.

A complete understanding of the invention may .be had by reference to the following detailed y,description when considered `in conjunction with the accompanying drawing, wherein Fig. A1 is a plan view of an apparatus ,made in accordance with the present invention;

Fig. 2 is an enlarged fragmentary View ofthe driving sleeve and cam therein;

Fig. 3 is a transverse sectional view taken substantially along the line 3-3 of Fig. 2 in the direction of the arrows;

Fig. 4 is an enlarged fragmentary view taken substantially along the line 4-4 of Fig. 1 in the direction of the arrows and showing the wheel having the cam surfaces thereon for closing the solenoid energizing switch; and

Fig. 5 is an enlarged fragmentary longitudinal sectional view taken substantially along the line 5 5 of Fig. 1 in the direction of the arrows showing some details of the valve and valve seats in the crystal converter.

Referring now tothe drawings, wherein like `reference characters designate .the same ,parts throughout the several views, one ,form of the ap paratus is shownmounted on a base 8, .on which there 'is supported a ,suitable tail stock chuck or vise 9, adapted lto hold a crystal converter unit I0 in a position where its valve stem -I'I ,may 'be gripped by a chuck I2. The crystal converter unit It includes a valve member I;3 slidableina tubular element I4 and lhaving'two seating faces `I5 and I6, which are adapted to seat against a valve seat 'Il and a yvalve seat I8, respectively. The valve seat I7 is formed as .a shoulder of .the vtubular element I4 and the valveseat 'I 8 is formed as a shoulder of a coaxially positioned tubular element I9.

In Ythe operation ofthe apparatus, the .seating faces l|15 and I6 are lbumped 'or hammered against the vvalve seats I'I and I8 while'not'f'rotatingon `the axis of the-valve member, but'the valve-member is rotated intermittently to lpresent vdifferent surfaces ofthe faces VI5 and I 6 in `association with different areas of the `valve seats I-'I and ;I8,-'thus to insure that a tight t `is yeffected between the seating Ifaces of the valve member and its associated valve'seats.

`Suitably `mounted upon the 'base l8 is Aa driving motor 25 'for 'driving a shaft 216 'extending into -a speed reducer 27, which hasa-n output shaft 28. The output `shaft "218 of the 4speed "reducer has mounted `upon it 'a ycam wheel 29, hav-ing Aa plurality of cam bumps 30 lthereon (Fig. 4) adapted to actuate an arm 3l, which, Vthrough a pin 32, 4serves to 4close -a switch 33. The switch-33 controls the lsupply of power to a solenoid 34, having a Icore 35, which carries .an actuator arm 36,

lposition to engage a collar 31 von a chuck driv in-g shaft 3'8. `The -chuc'k 'driving shaft VTB has the chuck I2 fixed `at its 'rightendand iisslidably and rotatably journalled -in a A'pair of `:bearing members 39 and -4-0, which extend .upwardly from the base 8. Interposed between the bearing member 40 and the collar 31 is a compression spring 4 I, which urges the chuck driving shaft 38 to the right (Fig. 1) and normally tends to force the seating face I6 against the valve seat I8. In this operation, the spring 4I is aided by a spring 42 forming a part of the converter unit I0.

Adjacent its left end, the chuck driving shaft 38. extends into a sleeve 43 attached to the end of the shaft 28 and cam wheel 29 in any suitable manner. The chuck driving shaft 38 is slidable within the sleeve 43 and carries a cam follower pin 44, which extends radially on opposite sides of the shaft 38 into cam slots 45 and 46 formed in the walls of the sleeve 43 and diametrically opposed one to another. The cam slots 4S and 46 are of exactly the same shape and are generally of rectangular shape and each have two rounded protuberances 41 and 48 adjacent their mid portions, the inner surfaces of which are spaced apart just suiiciently to permit the pin 44 to pass between them when the shaft 38 is reciprocated. The portions of the cam slots 45 and 46 removed from the rounded protuberances 41 and 48 are provided so that, although the motor 25 and speed reducer 21 drive the sleeve 43 at a constant rate of speed, the chuck driving shaft 38 will not be driven by the sleeve 43 at a constant rate of speed due to the fact that the solenoid 34 will be intermittently energized by switch 33, and, when the solenoid is energized, the shaft -38 will be moved to its lefthand position, as :shown in Fig. 1, and as it approaches the limit of its travel to bump the seating face l5 against the valve seat l1, the pin 44 will be free of the protuberances 41 and 48 and the valve will be bumped against the valve seat while no rotation is being imparted to it. Similarly, when the solenoid'34 is deenergized bythe opening of switch 33, the spring 4I, in cooperation with spring 42, will shift the pin 44 from its lefthand position, as shown in Fig. 1, over to an extreme right hand position, as shown by the dotted line in Fig. 1. Thus, when the valve member `I3 is carried to a position where its seating face i6 engages the valve seat I8, no rotation will be imparted to the valve while it is in engagement with the seat I8. The contour of the cam bumps 30 is so arranged that the switch 33 will be closed for an interval of suiciently short duration that no rotary motion will be imparted to the valve while its seating faces I5 and I6 are in engagement with their respective valve seats l1 and i8. Obviously, while the shaft 38 is reciprocating, either under the influence of the solenoid 34 or under the influence of the springs 4| and 42, the shaft will be driven at a faster rate of speed than the speed of rotation of the sleeve 43 due to the fact that the pin 44 will ride up on the rounded protuberances 41 and 48 in passing between them, depending upon the direction of rotation of the sleeve 43.

What is claimed is:

1. An apparatus for forming cooperating seating surfaces on a valve member and on a valve seat comprising a sleeve having a cam shaped slot therein, means for rotating said sleeve, a shaft having a cam follower engaging said slot, said cam shaped slot having a cam rise intermediate axially extending end portions of the slot, means for reciprocating said shaft whereby a rotary motion is imparted to said shaft intermediate the ends of its reciprocatory movement, and means for attaching said valve member to said shaft.

2. In an apparatus for forming opposed surfaces on a valve and on cooperating opposed seats for said valve, a valve engaging member, a spring for urging said member toward one seat engagement, a solenoid for moving the member toward the opposite seat engagement, a continuously driven sleeve, a shaft extending into said sleeve, means connecting said shaft to said member, means driven by said sleeve for causing actuation of the solenoid, a shaft driving pin on said shaft, and a pair of driving surfaces on said sleeve for engagement with said pin to rotate the shaft intermediate the extremes of its reciprocation to thereby rotate said member.

3. Anapparatus for forming cooperating seating surfaces on a valve member and on a valve seat comprising means connectible to said valve member, meansv for imparting reciprocation to the means connectible to the valve member, a rotary driving means, and means of connection between the driving means and means connectible to the valve member including a sleeve having a cam shaped slot therein, and a shaft having a cam follower engaging said slot, said cam shaped slot having a cam rise intermediate axially ex,- tending end portions of the slot whereby rotary motion will be transmitted to the valve member intermediate the ends of its reciprocatory movement.

4. An apparatus for forming cooperating seating surfaces on a valve member and on a valve seat comprising means connectible to said valve member, means for imparting reciprocation to the means connectible to the valve member, a rotary driving means, a switch actuating cam member driven by said driving means, a switch operated by said cam member for causing actuation of the reciprocation imparting means, and means of connection between the driving means and means connectible to the valve member including a sleeve having a cam shaped slot therein, and a shaft having a cam follower engaging said slot, said cam shaped slot having a cam rise intermediate axially extending end portions of the slot whereby rotary motion will be transmitted to the valve member intermediate the ends of its reciprocatory movement.

`WILBUR L. NELSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,699,003 Maupin Jan. 15, 1929 2,089,279 Loefiler Aug. 10, 1931 2,118,858 Newhall May 31, 1938 2,238,814 Kneass, Jr Apr. 15, 1941 2,396,082 Bugg Mar. 5, 1946 

